This blog follows these ones :
We now deal with the SAP instance startup.
Connect to the server as user sidadm and do as follows :
SAP services restart :
SQLServer services restart :
You can then use the SQL Server management Studio to restart the database :
Note : the database was previously brought offline. The sidadm user uses the SID database as its primary logon database.
This means you'll have to logon to the database instance as user "sa" through SQL Server Authentification :
Then you can bring the SID database online :
The database is then up and running.
You can restart the SAP instances using the SAP MMC :
Startup of the Diagnostics agent :
This instance starts instantly.
We start the SAP SID instance :
The SID instance startup can take up to several minutes, especially if you also have an J2ee instance running in case of a dual stack system.
Still you can check the instance startup here :
JAVA part :
Once everything is started correctly, everything should be green :
The SAP instance is then fully started and can be used.
Also read the following posts for the complete procedure :